Government of Canada navigation bar

Symbol of the Government of Canada

Primary site navigation bar

Breadcrumb

  1. Home
  2. Transport Canada
  3. CANUTEC
  4. Emergency Response Guidebook 2016
  5. Table 3 - Initial Isolation and Protective Action Distances for Large Spills for Different Quantities of Six Common TIH (PIH in the US) Gases

Table 3 - Initial Isolation and Protective Action Distances for Large Spills for Different Quantities of Six Common TIH (PIH in the US) Gases

Table 3 lists Toxic Inhalation Hazard materials that may be more commonly encountered.

The selected materials are:

The materials are presented in alphabetical order and provide Initial Isolation and Protective Action Distances FOR LARGE SPILLS (more than 208 liters or 55 US gallons) involving different container types (therefore different volume capacities) for day time and night time situations and different wind speeds.

Estimating Wind Speed and Environmental Clues

mph km/h Wind Description Specifications
< 6 < 10 Low wind Wind felt on face; leaves rustle; ordinary vane moved by wind
6 - 12 10 - 20 Moderate wind Raises dust, loose paper; small branches are moved
> 12 > 20 High wind Large branches in motion; whistling heard in telephone wires; umbrella used with difficulty

Change to imperial units

Transport 
Container
UN 1005 Ammonia, anhydrous: Large Spills
First Isolate in all directions Then Protect persons Downwind during
Day Night
Low wind
(<10 km/h)
Moderate wind
(10 - 20 km/h)
High wind
(>20 km/h)
Low wind
(<10 km/h)
Moderate wind
(10 - 20 km/h)
High wind
(>20 km/h)
m km km km km km km
Rail tank car 300 1.7 1.3 1.0 4.3 2.3 1.3
Highway tank truck
or trailer
150 0.9 0.5 0.4 2.0 0.8 0.6
Agricultural nurse tank 60 0.5 0.3 0.3 1.3 0.3 0.3
Multiple small cylinders 30 0.3 0.2 0.1 0.7 0.3 0.2
Transport
Container
UN 1017 Chlorine: Large Spills
Rail tank car 1000 9.9 6.4 5.1 11+ 9.0 6.7
Highway tank truck
or trailer
600 5.8 3.4 2.9 6.7 5.0 4.1
Multiple ton cylinders 300 2.1 1.3 1.0 4.0 2.4 1.3
Multiple small cylinders
or single ton cylinder
150 1.5 0.8 0.5 2.9 1.3 0.6

” + ” means distance can be larger in certain atmospheric conditions

Date Modified:
2016-08-25